bd804eba1c
Introduce the pm_power_off_prepare() callback that can be registered by the interested platforms in analogy with pm_idle() and pm_power_off(), used for preparing the system to power off (needed by ACPI). This allows us to drop acpi_sysclass and device_acpi that are only defined in order to register the ACPI power off preparation callback, which is needed by pm_power_off() registered in a much different way. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
/*
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* poweroff.c - ACPI handler for powering off the system.
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*
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* AKA S5, but it is independent of whether or not the kernel supports
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* any other sleep support in the system.
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*
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* Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
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*
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* This file is released under the GPLv2.
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*/
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#include <linux/pm.h>
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#include <linux/init.h>
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#include <acpi/acpi_bus.h>
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#include <linux/sysdev.h>
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#include <asm/io.h>
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#include "sleep.h"
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int acpi_sleep_prepare(u32 acpi_state)
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{
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#ifdef CONFIG_ACPI_SLEEP
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/* do we have a wakeup address for S2 and S3? */
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if (acpi_state == ACPI_STATE_S3) {
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if (!acpi_wakeup_address) {
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return -EFAULT;
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}
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acpi_set_firmware_waking_vector((acpi_physical_address)
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virt_to_phys((void *)
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acpi_wakeup_address));
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}
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ACPI_FLUSH_CPU_CACHE();
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acpi_enable_wakeup_device_prep(acpi_state);
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#endif
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acpi_gpe_sleep_prepare(acpi_state);
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acpi_enter_sleep_state_prep(acpi_state);
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return 0;
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}
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#ifdef CONFIG_PM
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static void acpi_power_off_prepare(void)
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{
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/* Prepare to power off the system */
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acpi_sleep_prepare(ACPI_STATE_S5);
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}
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static void acpi_power_off(void)
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{
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/* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
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printk("%s called\n", __FUNCTION__);
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local_irq_disable();
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/* Some SMP machines only can poweroff in boot CPU */
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acpi_enter_sleep_state(ACPI_STATE_S5);
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}
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static int acpi_poweroff_init(void)
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{
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if (!acpi_disabled) {
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u8 type_a, type_b;
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acpi_status status;
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status =
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acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
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if (ACPI_SUCCESS(status)) {
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pm_power_off_prepare = acpi_power_off_prepare;
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pm_power_off = acpi_power_off;
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}
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}
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return 0;
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}
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late_initcall(acpi_poweroff_init);
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#endif /* CONFIG_PM */
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